Calender knife



Aug. 2, 1927. 1,637,784

- KLOYLER CALENDER KNIFE I Filed June 8, 1925 \NVENTOR Kimball Qyler, BY W ATTORNEY r Patented Aug. 2, 1927.

D; (STATES; A E T OFFICE:

KIMBALL OYLER, on Los nnestns, CALIFORNIA, nssrcnoa TO THE GOODYEAR TIRE 8G RUBBER COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO.

CALENDER KNIFE.

Application filed June 8, 1925. Serial No. 35,621.

My invention relates to attachments for mills and calenders such as are commonly employed in the rubber industry and it is particularly directed to means for cutting and removing the plastic'material.

The object of my invention is to provide an improved trimmer to sever selvage, or bands of rubber, from a portion being calendered or worked on a mill.

Before a rubber composition is vulcanized, it is necessary to incorporate the vulcanizing ingredients, accelerators, and fillers. In addition, it is common practice to give the raw material its final shape before destroying its plastic properties. By far the larger number of these operations are carried out on mills or calendars. Not only are mills employed in incorporating the various compounding ingredients, but foreign matter is often washed out of the plastic in a manner not unlike that utilized in compounding processes. I

In all such cases, a certain amount of the milled product is extruded near the ends of the rolls and must be removed. Moreover, where a calendered sheet is being prepared, the product must have a smooth edge. In the past this trimming has been effected in more or less improvised manner. According to the present invention, I have mounted a knife or suitable severing device in resilient relation with the calender rolls and thereby have been able to secure uniform results.

In the attached drawings Fig. 1 is a side view showing the particular relation of my device with the mill rolls; and

Fig. 2 is a perspective view, on somewhat a larger scale, of a device constructed according to the principles of my invention.

The device comprises an elongate suporting member 1, having a pair of parallel l ug plates 2 rigidly joined therewith. Each of the lugs is provided with an opening within which a stem 3 of an ovate knife is supported. That portion of the stemv of the knife contained within the parallel lugs, is surrounded by a helical spring 4. A cotter key 5 engages the stem of the knife through holes provided therefor and is adapted to retain the knife in adjusted operable position. It will be noted that the key tends to limit the forward motion of the knife against the force of the spring.

The device may be held in position in any suitable manner. For example, the supporting member 1 is provided at one end with an inverted Uformation G which is adapted to engage a pan 7, in a manner illustrated in Fig. 1. It may be secured in this position by a set screw 8- disposed in an opening 9 having suitably threaded walls. In practicing my invention, it will be noted that as the roll moves in the direction of the arrow, the overflow is severed by the ovate knife, the severed material being, at the same time, removed by a cooperating scraper 10, which is bolted to a suitable support 11. The trimmer may be adjusted in any position along the pan and in case it is to be employed in making bands or strips no scraper will be found necessary. In the latter event, the several trimmers are adjusted in spaced relation, depending upon the width of the band desired.

It will be noted that by practicing my invention there is at all times a constant pressure between the knife edge and the roll. Moreover, the pressure may be adjusted in order to prove effective against any thickness of rubber.

It is obvious that although I have disclosed but a single embodiment of myinvention, it may be subjected to wide variations without departing from the principles herein set forth, and I desire, therefore, that it shall be limited only in accordance with the appended claims.

lVhat I claim is:

1. A trimming device for calendering machines. comprising an elongate knife member adapted for linear movement, resilient means for. maintaining the latter in engagement with the roll of the calender, and a scraper operative in conjunction with the knife for removing scraps from the roll.

2. A device for cutting rubber comprising an elongate supporting member having projecting integral lugs and an end of inverted U-shape, a knife having a stem provided with a series of spaced openings mounted in openings provided in the lugs, a spring mounted about the stem of the knife between the lugs and a pin disposed in one of the openings in the stem and in engagement with the spring.

3. The combination with a trimming device adapted to engage a calender roll, of a g1-v v 1,637,784

scraper operatively associated With the trimhaving a knife at one end, and means in-. ming device and adaptedto engage'the r011 eluding a U-shape clamp memberi secured to remove scraps of severed material from transversely to the arm for clamping the 10 the latter. arm to the edge of the pan.

5 4..AV. trimming device adapted to he at- In Witness whereof, I have hereunto tached to a calenderingrmaehine having a signed my name. pan thereon, salddevlce comprlslng an arm KIMBA'LL OYLER. 

